Student Science-rich Websites
Peep and the Big World: http://www.peepandthebigwideworld.com/
Sesame Street Science Segments (adults to help choose perhaps): http://www.sesamestreet.org/browseallvideos?p_p_id=browsegpv_WAR_browsegpvportlet&p_p_lifecycle=1&p_p_state=normal&p_p_mode=view&_browsegpv_WAR_browsegpvportlet_keywords=science
Science Experiments and more: http://pbskids.org/zoom/activities/sci/
Exploratorium: http://www.exploratorium.edu/
BBC Science: http://www.bbc.co.uk/schools/ks2bitesize/science/
Science Kids : http://www.sciencekids.co.nz/ (unfortunately it has many ads)
Rainforest at Night: http://www.nationalgeographic.com/features/00/earthpulse/rainforest/index_flash-feature.html